ImageItem.py 17.3 KB
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from pyqtgraph.Qt import QtGui, QtCore
import numpy as np
try:
    import scipy.weave as weave
    from scipy.weave import converters
except:
    pass
import pyqtgraph.functions as fn
import pyqtgraph.debug as debug
from GraphicsObject import GraphicsObject

__all__ = ['ImageItem']
class ImageItem(GraphicsObject):
    """
    GraphicsObject displaying an image. Optimized for rapid update (ie video display)
    
    """
    
    
    sigImageChanged = QtCore.Signal()
    
    ## performance gains from this are marginal, and it's rather unreliable.
    useWeave = False
    
    def __init__(self, image=None, **kargs):
        """
        See setImage for all allowed arguments.
        """
        GraphicsObject.__init__(self)
        #self.pixmapItem = QtGui.QGraphicsPixmapItem(self)
        #self.qimage = QtGui.QImage()
        #self._pixmap = None
        
        self.image = None   ## original image data
        self.qimage = None  ## rendered image for display
        #self.clipMask = None
        
        self.paintMode = None
        #self.useWeave = True
        
        self.levels = None  ## [min, max] or [[redMin, redMax], ...]
        self.lut = None
        
        #self.clipLevel = None
        self.drawKernel = None
        self.border = None
        
        if image is not None:
            self.setImage(image, **kargs)
        else:
            self.setOpts(**kargs)

    def setCompositionMode(self, mode):
        self.paintMode = mode
        self.update()

    ## use setOpacity instead.
    #def setAlpha(self, alpha):
        #self.setOpacity(alpha)
        #self.updateImage()
        
    def setBorder(self, b):
        self.border = fn.mkPen(b)
        self.update()
        
    def width(self):
        if self.image is None:
            return None
        return self.image.shape[0]
        
    def height(self):
        if self.image is None:
            return None
        return self.image.shape[1]

    def boundingRect(self):
        if self.image is None:
            return QtCore.QRectF(0., 0., 0., 0.)
        return QtCore.QRectF(0., 0., float(self.width()), float(self.height()))

    #def setClipLevel(self, level=None):
        #self.clipLevel = level
        #self.updateImage()
        
    #def paint(self, p, opt, widget):
        #pass
        #if self.pixmap is not None:
            #p.drawPixmap(0, 0, self.pixmap)
            #print "paint"

    def setLevels(self, levels, update=True):
        """
        Set image scaling levels. Can be one of: 
            [blackLevel, whiteLevel]
            [[minRed, maxRed], [minGreen, maxGreen], [minBlue, maxBlue]]
        Only the first format is compatible with lookup tables.
        """
        self.levels = levels
        if update:
            self.updateImage()
        
    def getLevels(self):
        return self.levels
        #return self.whiteLevel, self.blackLevel

    def setLookupTable(self, lut, update=True):
        """
        Set the lookup table to use for this image. (see functions.makeARGB for more information on how this is used)
        Optionally, lut can be a callable that accepts the current image as an argument and returns the lookup table to use."""
        self.lut = lut
        if update:
            self.updateImage()

    def setOpts(self, update=True, **kargs):
        if 'lut' in kargs:
            self.setLookupTable(kargs['lut'], update=update)
        if 'levels' in kargs:
            self.setLevels(kargs['levels'], update=update)
        #if 'clipLevel' in kargs:
            #self.setClipLevel(kargs['clipLevel'])
        if 'opacity' in kargs:
            self.setOpacity(kargs['opacity'])
        if 'compositionMode' in kargs:
            self.setCompositionMode(kargs['compositionMode'])
        if 'border' in kargs:
            self.setBorder(kargs['border'])

    def setRect(self, rect):
        """Scale and translate the image to fit within rect."""
        self.resetTransform()
        self.translate(rect.left(), rect.top())
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        self.scale(rect.width() / self.width(), rect.height() / self.height())
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    def setImage(self, image=None, autoLevels=None, **kargs):
        """
        Update the image displayed by this item.
        Arguments:
            image
            autoLevels
            lut
            levels
            opacity
            compositionMode
            border
        
        """
        prof = debug.Profiler('ImageItem.setImage', disabled=True)
        
        gotNewData = False
        if image is None:
            if self.image is None:
                return
        else:
            gotNewData = True
            if self.image is None or image.shape != self.image.shape:
                self.prepareGeometryChange()
            self.image = image.view(np.ndarray)
            
        prof.mark('1')
            
        if autoLevels is None:
            if 'levels' in kargs:
                autoLevels = False
            else:
                autoLevels = True
        if autoLevels:
            img = self.image
            while img.size > 2**16:
                img = img[::2, ::2]
            mn, mx = img.min(), img.max()
            if mn == mx:
                mn = 0
                mx = 255
            kargs['levels'] = [mn,mx]
        prof.mark('2')
        
        self.setOpts(update=False, **kargs)
        prof.mark('3')
        
        self.qimage = None
        self.update()
        prof.mark('4')

        if gotNewData:
            self.sigImageChanged.emit()


        prof.finish()



    def updateImage(self, *args, **kargs):
        ## used for re-rendering qimage from self.image.
        
        ## can we make any assumptions here that speed things up?
        ## dtype, range, size are all the same?
        defaults = {
            'autoLevels': False,
        }
        defaults.update(kargs)
        return self.setImage(*args, **defaults)
        
        


    def render(self):
        prof = debug.Profiler('ImageItem.render', disabled=True)
        if self.image is None:
            return
        if callable(self.lut):
            lut = self.lut(self.image)
        else:
            lut = self.lut
            
        argb, alpha = fn.makeARGB(self.image, lut=lut, levels=self.levels)
        self.qimage = fn.makeQImage(argb, alpha)
        #self.pixmap = QtGui.QPixmap.fromImage(self.qimage)
        prof.finish()
    

    def paint(self, p, *args):
        prof = debug.Profiler('ImageItem.paint', disabled=True)
        if self.image is None:
            return
        if self.qimage is None:
            self.render()
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            prof.mark('render QImage')
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        if self.paintMode is not None:
            p.setCompositionMode(self.paintMode)
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            prof.mark('set comp mode')
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        p.drawImage(QtCore.QPointF(0,0), self.qimage)
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        prof.mark('p.drawImage')
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        if self.border is not None:
            p.setPen(self.border)
            p.drawRect(self.boundingRect())
        prof.finish()


    def getHistogram(self, bins=500, step=3):
        """returns x and y arrays containing the histogram values for the current image.
        The step argument causes pixels to be skipped when computing the histogram to save time."""
        if self.image is None:
            return None,None
        stepData = self.image[::step, ::step]
        hist = np.histogram(stepData, bins=bins)
        return hist[1][:-1], hist[0]

    def setPxMode(self, b):
        """Set whether the item ignores transformations and draws directly to screen pixels."""
        self.setFlag(self.ItemIgnoresTransformations, b)
    
    def setScaledMode(self):
        self.setPxMode(False)

    def getPixmap(self):
        if self.qimage is None:
            self.render()
            if self.qimage is None:
                return None
        return QtGui.QPixmap.fromImage(self.qimage)
    
    def pixelSize(self):
        """return scene-size of a single pixel in the image"""
        br = self.sceneBoundingRect()
        if self.image is None:
            return 1,1
        return br.width()/self.width(), br.height()/self.height()

    def mousePressEvent(self, ev):
        if self.drawKernel is not None and ev.button() == QtCore.Qt.LeftButton:
            self.drawAt(ev.pos(), ev)
            ev.accept()
        else:
            ev.ignore()
        
    def mouseMoveEvent(self, ev):
        #print "mouse move", ev.pos()
        if self.drawKernel is not None:
            self.drawAt(ev.pos(), ev)
    
    def mouseReleaseEvent(self, ev):
        pass
    
    def tabletEvent(self, ev):
        print ev.device()
        print ev.pointerType()
        print ev.pressure()
    
    def drawAt(self, pos, ev=None):
        pos = [int(pos.x()), int(pos.y())]
        dk = self.drawKernel
        kc = self.drawKernelCenter
        sx = [0,dk.shape[0]]
        sy = [0,dk.shape[1]]
        tx = [pos[0] - kc[0], pos[0] - kc[0]+ dk.shape[0]]
        ty = [pos[1] - kc[1], pos[1] - kc[1]+ dk.shape[1]]
        
        for i in [0,1]:
            dx1 = -min(0, tx[i])
            dx2 = min(0, self.image.shape[0]-tx[i])
            tx[i] += dx1+dx2
            sx[i] += dx1+dx2

            dy1 = -min(0, ty[i])
            dy2 = min(0, self.image.shape[1]-ty[i])
            ty[i] += dy1+dy2
            sy[i] += dy1+dy2

        #print sx
        #print sy
        #print tx
        #print ty
        #print self.image.shape
        #print self.image[tx[0]:tx[1], ty[0]:ty[1]].shape
        #print dk[sx[0]:sx[1], sy[0]:sy[1]].shape
        ts = (slice(tx[0],tx[1]), slice(ty[0],ty[1]))
        ss = (slice(sx[0],sx[1]), slice(sy[0],sy[1]))
        #src = dk[sx[0]:sx[1], sy[0]:sy[1]]
        #mask = self.drawMask[sx[0]:sx[1], sy[0]:sy[1]]
        mask = self.drawMask
        src = dk
        #print self.image[ts].shape, src.shape
        
        if callable(self.drawMode):
            self.drawMode(dk, self.image, mask, ss, ts, ev)
        else:
            src = src[ss]
            if self.drawMode == 'set':
                if mask is not None:
                    mask = mask[ss]
                    self.image[ts] = self.image[ts] * (1-mask) + src * mask
                else:
                    self.image[ts] = src
            elif self.drawMode == 'add':
                self.image[ts] += src
            else:
                raise Exception("Unknown draw mode '%s'" % self.drawMode)
            self.updateImage()
        
    def setDrawKernel(self, kernel=None, mask=None, center=(0,0), mode='set'):
        self.drawKernel = kernel
        self.drawKernelCenter = center
        self.drawMode = mode
        self.drawMask = mask





    #def setImage(self, image=None, copy=True, autoRange=True, clipMask=None, white=None, black=None, axes=None):
        #prof = debug.Profiler('ImageItem.updateImage 0x%x' %id(self), disabled=True)
        ##debug.printTrace()
        #if axes is None:
            #axh = {'x': 0, 'y': 1, 'c': 2}
        #else:
            #axh = axes
        ##print "Update image", black, white
        #if white is not None:
            #self.whiteLevel = white
        #if black is not None:
            #self.blackLevel = black  
        
        #gotNewData = False
        #if image is None:
            #if self.image is None:
                #return
        #else:
            #gotNewData = True
            #if self.image is None or image.shape != self.image.shape:
                #self.prepareGeometryChange()
            #if copy:
                #self.image = image.view(np.ndarray).copy()
            #else:
                #self.image = image.view(np.ndarray)
        ##print "  image max:", self.image.max(), "min:", self.image.min()
        #prof.mark('1')
        
        ## Determine scale factors
        #if autoRange or self.blackLevel is None:
            #if self.image.dtype is np.ubyte:
                #self.blackLevel = 0
                #self.whiteLevel = 255
            #else:
                #self.blackLevel = self.image.min()
                #self.whiteLevel = self.image.max()
        ##print "Image item using", self.blackLevel, self.whiteLevel
        
        #if self.blackLevel != self.whiteLevel:
            #scale = 255. / (self.whiteLevel - self.blackLevel)
        #else:
            #scale = 0.
        
        #prof.mark('2')
        
        ### Recolor and convert to 8 bit per channel
        ## Try using weave, then fall back to python
        #shape = self.image.shape
        #black = float(self.blackLevel)
        #white = float(self.whiteLevel)
        
        #if black == 0 and white == 255 and self.image.dtype == np.ubyte:
            #im = self.image
        #elif self.image.dtype in [np.ubyte, np.uint16]:
            ## use lookup table instead
            #npts = 2**(self.image.itemsize * 8)
            #lut = self.getLookupTable(npts, black, white)
            #im = lut[self.image]
        #else:
            #im = self.applyColorScaling(self.image, black, scale)
            
        #prof.mark('3')

        #try:
            #im1 = np.empty((im.shape[axh['y']], im.shape[axh['x']], 4), dtype=np.ubyte)
        #except:
            #print im.shape, axh
            #raise
        #alpha = np.clip(int(255 * self.alpha), 0, 255)
        #prof.mark('4')
        ## Fill image 
        #if im.ndim == 2:
            #im2 = im.transpose(axh['y'], axh['x'])
            #im1[..., 0] = im2
            #im1[..., 1] = im2
            #im1[..., 2] = im2
            #im1[..., 3] = alpha
        #elif im.ndim == 3: #color image
            #im2 = im.transpose(axh['y'], axh['x'], axh['c'])
            #if im2.shape[2] > 4:
                #raise Exception("ImageItem got image with more than 4 color channels (shape is %s; axes are %s)" % (str(im.shape), str(axh)))
            ###      [B G R A]    Reorder colors
            #order = [2,1,0,3] ## for some reason, the colors line up as BGR in the final image.
            
            #for i in range(0, im.shape[axh['c']]):
                #im1[..., order[i]] = im2[..., i]    
            
            ### fill in unused channels with 0 or alpha
            #for i in range(im.shape[axh['c']], 3):
                #im1[..., i] = 0
            #if im.shape[axh['c']] < 4:
                #im1[..., 3] = alpha
                
        #else:
            #raise Exception("Image must be 2 or 3 dimensions")
        ##self.im1 = im1
        ## Display image
        #prof.mark('5')
        #if self.clipLevel is not None or clipMask is not None:
            #if clipMask is not None:
                #mask = clipMask.transpose()
            #else:
                #mask = (self.image < self.clipLevel).transpose()
            #im1[..., 0][mask] *= 0.5
            #im1[..., 1][mask] *= 0.5
            #im1[..., 2][mask] = 255
        #prof.mark('6')
        ##print "Final image:", im1.dtype, im1.min(), im1.max(), im1.shape
        ##self.ims = im1.tostring()  ## Must be held in memory here because qImage won't do it for us :(
        #prof.mark('7')
        #try:
            #buf = im1.data
        #except AttributeError:
            #im1 = np.ascontiguousarray(im1)
            #buf = im1.data
        
        #qimage = QtGui.QImage(buf, im1.shape[1], im1.shape[0], QtGui.QImage.Format_ARGB32)
        #self.qimage = qimage
        #self.qimage.data = im1
        #self._pixmap = None
        #prof.mark('8')
        
        ##self.pixmap = QtGui.QPixmap.fromImage(qimage)
        #prof.mark('9')
        ###del self.ims
        ##self.item.setPixmap(self.pixmap)
        
        #self.update()
        #prof.mark('10')
        
        #if gotNewData:
            ##self.emit(QtCore.SIGNAL('imageChanged'))
            #self.sigImageChanged.emit()
            
        #prof.finish()
        
    #def getLookupTable(self, num, black, white):
        #num = int(num)
        #black = int(black)
        #white = int(white)
        #if white < black:
            #b = black
            #black = white
            #white = b
        #key = (num, black, white)
        #lut = np.empty(num, dtype=np.ubyte)
        #lut[:black] = 0
        #rng = lut[black:white]
        #try:
            #rng[:] = np.linspace(0, 255, white-black)[:len(rng)]
        #except:
            #print key, rng.shape
        #lut[white:] = 255
        #return lut
        
        
    #def applyColorScaling(self, img, offset, scale):
        #try:
            #if not ImageItem.useWeave:
                #raise Exception('Skipping weave compile')
            ##sim = np.ascontiguousarray(self.image)  ## should not be needed
            #sim = img.reshape(img.size)
            ##sim.shape = sim.size
            #im = np.empty(sim.shape, dtype=np.ubyte)
            #n = im.size
            
            #code = """
            #for( int i=0; i<n; i++ ) {
                #float a = (sim(i)-offset) * (float)scale;
                #if( a > 255.0 )
                    #a = 255.0;
                #else if( a < 0.0 )
                    #a = 0.0;
                #im(i) = a;
            #}
            #"""
            
            #weave.inline(code, ['sim', 'im', 'n', 'offset', 'scale'], type_converters=converters.blitz, compiler = 'gcc')
            ##sim.shape = shape
            #im.shape = img.shape
        #except:
            #if ImageItem.useWeave:
                #ImageItem.useWeave = False
                ##sys.excepthook(*sys.exc_info())
                ##print "=============================================================================="
                ##print "Weave compile failed, falling back to slower version."
            ##img.shape = shape
            #im = ((img - offset) * scale).clip(0.,255.).astype(np.ubyte)
        #return im